i thought i might say this agin hope it helps u
ok if u ever need a backup of a map or something and u dont want to reinstall heres what ya do..
1. go to My Computer
2. make sure your halo cd is in your disk drive
3. right-click on your disk drive and click open
4. there are a few folders find the folder called Filescab and open it
5. now there are 6 zip files Cab1,Cab2, etc, etc
6. each of these cab files contains a few map files
7. open winzip and which ever file u tryed to mod or need a back-up of just extract the .map file where u want to put it, and when u zip it the file u zipped will just be a copy so you dont have to worry about it deleting it off ur cd or anything like that
well thats it , later